Light Emitting Display Panel and Light Emitting Display Apparatus Including the Same

ABSTRACT

A light emitting display panel includes a substrate, a pixel driving circuit disposed on the substrate, a planarization layer disposed on the pixel driving circuit, a pixel driving electrode disposed on the planarization layer and electrically connected to the pixel driving circuit, a light emitting layer disposed on the pixel driving electrode, and a common electrode disposed on the light emitting layer. The pixel driving electrode includes a plurality of first electrodes apart from one another and a second electrode covering the first electrodes, and at least one of the second electrode or the plurality of first electrodes is connected to the pixel driving circuit.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of the Republic of Korea PatentApplication No. 10-2019-0171011 filed on Dec. 19, 2019 and Republic ofKorea Patent Application No. 10-2020-0104046 filed on Aug. 19, 2020,each of which are hereby incorporated by reference in its entirety.

BACKGROUND Field of Technology

The present disclosure relates to a structure of a light emittingdisplay panel.

Discussion of the Related Art

In a process of manufacturing a light emitting display panel, particlesmay be located on a pixel driving electrode of one pixel. Also, when alight emitting layer and a common electrode are deposited on theparticles located on the pixel driving electrode, a defect may occurwhere the pixel driving electrode disposed under the particles isconnected to the common electrode.

Such a defect may cause a problem to one pixel, but when the defect issevere, the defect may cause a problem to a plurality of pixels includedin the light emitting display panel.

For example, the common electrode is connected to all pixels in common,and due to this, when the common electrode is electrically connected tothe pixel driving electrode in one pixel, the quality of the lightemitting display panel may be totally reduced.

SUMMARY

Accordingly, the present disclosure is directed to providing a lightemitting display panel that substantially obviates one or more problemsdue to limitations and disadvantages of the related art.

An aspect of the present disclosure is directed to providing a lightemitting display panel, including a pixel driving electrode whichincludes a plurality of first electrodes disposed apart from each otherand a second electrode covering the first electrodes, and a lightemitting display apparatus including the light emitting display panel.

Additional advantages and features of the disclosure will be set forthin part in the description which follows and in part will becomeapparent to those having ordinary skill in the art upon examination ofthe following or may be learned from practice of the disclosure. Theobjectives and other advantages of the disclosure may be realized andattained by the structure particularly pointed out in the writtendescription and claims hereof as well as the appended drawings.

To achieve these and other advantages and in accordance with the purposeof the disclosure, as embodied and broadly described herein, there isprovided a light emitting display panel including a substrate, a pixeldriving circuit disposed on the substrate, a planarization layerdisposed on the pixel driving circuit, a pixel driving electrodedisposed on the planarization layer and electrically connected to thepixel driving circuit, a light emitting layer disposed on the pixeldriving electrode, and a common electrode disposed on the light emittinglayer, wherein the pixel driving electrode includes a plurality of firstelectrodes apart from one another and a second electrode covering thefirst electrodes, and at least one of the second electrode and theplurality of first electrodes is connected to the pixel driving circuit.

In another aspect of the present disclosure, there is provided a lightemitting display apparatus including the light emitting display panel, agate driver supplying gate signals to a plurality of gate lines includedin the light emitting display panel, a data driver supplying datavoltages to a plurality of data lines included in the light emittingdisplay panel, and a controller controlling a function of each of thegate driver and the data driver.

It is to be understood that both the foregoing general description andthe following detailed description of the present disclosure areexemplary and explanatory and are intended to provide furtherexplanation of the disclosure as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the disclosure and are incorporated in and constitute apart of this application, illustrate embodiments of the disclosure andtogether with the description serve to explain the principle of thedisclosure. In the drawings:

FIG. 1 is an exemplary diagram illustrating a configuration of a lightemitting display apparatus according to one embodiment of the presentdisclosure;

FIG. 2 is an exemplary diagram illustrating a configuration of acontroller applied to the light emitting display apparatus according toone embodiment of the present disclosure;

FIG. 3 is an exemplary diagram illustrating a structure of each of aplurality of pixels included in a light emitting display apparatusaccording to one embodiment of the present disclosure;

FIG. 4 is an exemplary diagram illustrating a plane of a pixel drivingelectrode of a pixel included in a light emitting display panelaccording to one embodiment of the present disclosure;

FIG. 5 is an exemplary diagram illustrating a cross-sectional surfacetaken along line A-A′ illustrated in FIG. 4 according to one embodimentof the present disclosure;

FIG. 6 is an exemplary diagram illustrating a cross-sectional surface ofa light emitting display panel according to one embodiment of thepresent disclosure in a manufacturing process;

FIGS. 7A to 7C are exemplary diagrams illustrating a cross-sectionalsurface taken along line B-B′ of FIG. 4 according to one embodiment ofthe present disclosure;

FIG. 8 is an exemplary diagram illustrating a connection structurebetween a 2-1^(th) electrode and a 2-2^(th) electrode in a lightemitting display panel according to one embodiment of the presentdisclosure;

FIGS. 9A-9C are exemplary diagrams illustrating a method of forming anundercut region in a light emitting display panel according to thepresent disclosure;

FIG. 10 is an exemplary diagram illustrating a structure where a2-1^(th) electrode and a 2-2^(th) electrode are electricallydisconnected from each other by a repair process or an aging process, ina light emitting display panel according to one embodiment of thepresent disclosure;

FIG. 11 is another exemplary diagram illustrating a cross-sectionalsurface of a light emitting display panel according to one embodiment ofthe present disclosure;

FIGS. 12 to 14 are exemplary diagrams illustrating a process ofmanufacturing the light emitting display panel illustrated in FIG. 11according to one embodiment of the present disclosure;

FIG. 15 is another exemplary diagram illustrating a cross-sectionalsurface of a light emitting display panel according to one embodiment ofthe present disclosure;

FIGS. 16 and 17 are other exemplary diagrams illustrating a plane of apixel driving electrode of a pixel included in a light emitting displaypanel according to one embodiment of the present disclosure;

FIGS. 18A to 18C are exemplary diagrams illustrating a cross-sectionalsurface taken along line C-C′ illustrated in FIG. 16 according to oneembodiment of the present disclosure;

FIG. 19 is an exemplary diagram illustrating a connection relationshipbetween a pixel driving circuit and a light emitting device whenparticles are in a pixel of a light emitting display panel according toone embodiment of the present disclosure;

FIG. 20 is an exemplary diagram illustrating a cross-sectional surfacetaken along line D-D′ illustrated in FIG. 16 according to one embodimentof the present disclosure;

FIG. 21 is a plan view of each of four pixels applied to a lightemitting display panel according to one embodiment of the presentdisclosure;

FIG. 22 is another exemplary diagram illustrating a cross-sectionalsurface taken along line D-D′ illustrated in FIG. 16 according to oneembodiment of the present disclosure; and

FIG. 23 is another plan view of each of four pixels applied to a lightemitting display panel according to one embodiment of the presentdisclosure.

DETAILED DESCRIPTION

Reference will now be made in detail to the exemplary embodiments of thepresent disclosure, examples of which are illustrated in theaccompanying drawings. Wherever possible, the same reference numberswill be used throughout the drawings to refer to the same or like parts.

Advantages and features of the present disclosure, and implementationmethods thereof will be clarified through following embodimentsdescribed with reference to the accompanying drawings. The presentdisclosure may, however, be embodied in different forms and should notbe construed as limited to the embodiments set forth herein. Rather,these embodiments are provided so that this disclosure will be thoroughand complete, and will fully convey the scope of the present disclosureto those skilled in the art. Further, the present disclosure is onlydefined by scopes of claims.

A shape, a size, a ratio, an angle, and a number disclosed in thedrawings for describing embodiments of the present disclosure are merelyan example, and thus, the present disclosure is not limited to theillustrated details. Like reference numerals refer to like elementsthroughout. In the following description, when the detailed descriptionof the relevant known function or configuration is determined tounnecessarily obscure the important point of the present disclosure, thedetailed description will be omitted. In a case where ‘comprise’,‘have’, and ‘include’ described in the present specification are used,another part may be added unless ‘only˜’ is used. The terms of asingular form may include plural forms unless referred to the contrary.

In construing an element, the element is construed as including an errorrange although there is no explicit description.

In describing a position relationship, for example, when a positionrelation between two parts is described as ‘on˜’, ‘over˜’, ‘under˜’, and‘next˜’, one or more other parts may be disposed between the two partsunless ‘just’ or ‘direct’ is used.

In describing a time relationship, for example, when the temporal orderis described as ‘after˜’, ‘subsequent˜’, ‘next˜’, and ‘before˜’ a casewhich is not continuous may be included unless ‘just’ or ‘direct’ isused.

It will be understood that, although the terms “first”, “second”, etc.may be used herein to describe various elements, these elements shouldnot be limited by these terms. These terms are only used to distinguishone element from another. For example, a first element could be termed asecond element, and, similarly, a second element could be termed a firstelement, without departing from the scope of the present disclosure.

In describing the elements of the present disclosure, terms such asfirst, second, A, B, (a), (b), etc., may be used. Such terms are usedfor merely discriminating the corresponding elements from other elementsand the corresponding elements are not limited in their essence,sequence, or precedence by the terms. It will be understood that when anelement or layer is referred to as being “on” or “connected to” anotherelement or layer, it can be directly on or directly connected to theother element or layer, or intervening elements or layers may bepresent. Also, it should be understood that when one element is disposedon or under another element, this may denote a case where the elementsare disposed to directly contact each other, but may denote that theelements are disposed without directly contacting each other.

The term “at least one” should be understood as including any and allcombinations of one or more of the associated listed elements. Forexample, the meaning of “at least one of a first element, a secondelement, and a third element” denotes the combination of all elementsproposed from two or more of the first element, the second element, andthe third element as well as the first element, the second element, orthe third element.

Features of various embodiments of the present disclosure may bepartially or overall coupled to or combined with each other, and may bevariously inter-operated with each other and driven technically as thoseskilled in the art can sufficiently understand. The embodiments of thepresent disclosure may be carried out independently from each other, ormay be carried out together in co-dependent relationship.

FIG. 1 is an exemplary diagram illustrating a configuration of a lightemitting display apparatus according to the present disclosure, and FIG.2 is an exemplary diagram illustrating a configuration of a controllerapplied to the light emitting display apparatus according to the presentdisclosure.

The light emitting display apparatus according to the present disclosuremay configure an electronic device. Examples of the electronic devicemay include smartphones, tablet personal computers (PCs), televisions(TVs), monitors, etc.

The light emitting display apparatus according to the presentdisclosure, as illustrated in FIG. 1, may include a light emittingdisplay panel 100 which includes a display area AA for displaying animage and a non-display area NAA provided outside the display area AA, agate driver 200 which supplies a gate signal to a plurality of gatelines GL1 to GLg provided in the light emitting display panel 100, adata driver 300 which respectively supplies data voltages to a pluralityof data lines DL1 to DLd provided in the light emitting display panel100, and a controller 400 which controls driving of the gate driver 200and the data driver 300.

The controller 400, as illustrated in FIG. 2, a data aligner 430 whichrealigns pieces of input video data Ri, Gi, and Bi transferred from anexternal system on the basis of a timing synchronization signal TSStransferred from the external system to supply pieces of realigned imagedata Data to the data driver 300, a control signal generator 420 whichgenerates a gate control signal GCS and a data control signal DCS on thebasis of the timing synchronization signal TSS, an input unit 410 whichreceives the timing synchronization signal TSS and the input video dataRi, Gi, and Bi transferred from the external system and respectivelytransfers the input video data Ri, Gi, and Bi and the timingsynchronization signal TSS to the data aligner 430 and the controlsignal generator 420, and an output unit 440 which outputs the imagedata Data generated by the data aligner 430 and the data control signalDCS generated by the control signal generator 420 to the data driver 300and outputs the gate control signal GCS to the gate driver 200.

The gate driver 200 may be configured as an integrated circuit (IC), andthen, may be mounted in the non-display area NAA or may be directlyembedded into the non-display area NAA.

The data driver 300 may be mounted on a chip-on film (COF) attached onthe light emitting display panel 100. The COF may be connected to a mainboard with the controller 400 mounted thereon. In this case, the COF mayinclude a plurality of lines which electrically connect the controller400, the data driver 300, and the light emitting display panel 100, andto this end, the lines may be electrically connected to the main boardand a plurality of pads included in the light emitting display panel100. The main board may be electrically connected to an external boardwith the external system mounted thereon. The data driver 300 may bedirectly mounted on the light emitting display panel 100 and may beelectrically connected to the main board.

The external system may perform a function of driving the controller 400and the electronic device. That is, when the electronic device is asmartphone, the external system may transmit or receive various piecesof sound information, image information, and letter information over awireless communication network and may transmit image information to thecontroller 400.

The light emitting display panel 100 may include a plurality of pixels110 which each include a light emitting device and a pixel drivingcircuit for driving the light emitting device. Also, in the lightemitting display panel 100, a pixel area where each of the pixels 110 isprovided may be defined therein, and a plurality of signal lines fortransferring a driving signal to the pixel driving circuit may beprovided therein.

The signal lines may include various kinds of lines, in addition to thegate lines GL1 to GLg and the data lines DL1 to DLd.

FIG. 3 is an exemplary diagram illustrating a structure of each of aplurality of pixels included in a light emitting display apparatusaccording to the present disclosure.

A plurality of pixels 110, including a light emitting device ED and apixel driving circuit PDC for driving the light emitting device ED, maybe provided in a display area AA of a light emitting display panel 100.Also, in the light emitting display panel 100, a pixel area where eachof the pixels 110 is provided may be defined therein, and a plurality ofsignal lines for transferring a driving signal to the pixel drivingcircuit PDC may be provided therein.

The plurality of signal lines may include a plurality of gate lines GL,a plurality of data lines DL, a plurality of sensing pulse lines SPL, aplurality of sensing lines SL, a first driving power line PLA, a seconddriving power line PLB, and a plurality of emission lines EL.

The gate lines GL may be arranged at certain intervals in parallel in asecond direction (for example, a widthwise direction) of the lightemitting display panel 100.

The sensing pulse lines SPL may be arranged at certain intervals inparallel with the gate lines GL.

The data lines DL may be arranged at certain intervals in parallel in afirst direction (for example, a lengthwise direction) of the lightemitting display panel 100 to intersect with the gate lines GL and thesensing pulse lines SPL.

The sensing lines SL may be arranged at certain intervals in parallelwith the data lines DL.

The first driving power line PLA may be disposed apart from the dataline DL and the sensing line SL by a certain interval in parallel. Thefirst driving power line PLA may be connected to a power supply and maysupply each pixel 110 with a first driving power EVDD supplied from thepower supply.

The second driving power line PLB may supply each pixel 110 with asecond driving power EVSS supplied from the power supply.

The emission lines EL may be arranged in parallel with the gate linesGL.

The pixel driving circuit PDC may include a driving transistor Tdr whichcontrols the amount of current flowing in the light emitting device ED,a switching transistor Tsw1 which is connected between the data line DL,the driving transistor Tdr, and the gate line GL, and an emissiontransistor Tsw3 which controls a current flowing to the drivingtransistor Tdr. Also, the pixel driving circuit PDC may include acapacitor Cst and a sensing transistor Tsw2.

The switching transistor Tsw1 may be turned on by a gate pulse of a gatesignal VG transferred through the gate line GL and may output a datavoltage Vdata, supplied through the data line DL, to a gate electrode ofthe driving transistor Tdr.

The sensing transistor Tsw2 may be turned on by a scan signal SStransferred through the sensing pulse line SPL and may transfer asensing line voltage Vini, supplied through the sensing line SL, to asource electrode of the driving transistor Tdr or may transfer avoltage, applied to the source electrode of the driving transistor Tdr,to the sensing line SL.

The emission transistor Tsw3 may be turned on by an emission turn-onpulse of an emission signal EM transferred through the emission line ELand may allow a current to flow to the light emitting device ED throughthe driving transistor Tdr, or may be turned off by an emission turn-offsignal of the emission signal EM and may allow a current not to flow tothe light emitting device ED.

The capacitor Cst may be provided between the gate electrode and thesource electrode of the driving transistor Tdr and may be charged with adata voltage transferred through the switching transistor Tsw1, and thedriving transistor Tdr may be driven by a voltage charged into thecapacitor Cst.

That is, the driving transistor Tdr may be turned on by the voltagecharged into the capacitor Cst and may control the amount of datacurrent flowing to the light emitting device ED through the firstdriving power line PLA.

The light emitting device ED may emit light with the data currenttransferred from the driving transistor Tdr to irradiate the lighthaving luminance corresponding to the data current.

A structure of the pixel driving circuit PDC may be implemented to havevarious structures, in addition to a structure illustrated in FIG. 3.

For example, in FIG. 3, the transistors are provided as a P type,illustrated, and the pixel driving circuit PDC including fourtransistors is illustrated. However, the present disclosure is notlimited thereto, and in other embodiments, the pixel driving circuit PDCmay include two transistors, three transistors, or five transistors.

That is, in order to compensate for a variation of a threshold voltageor mobility caused by the degradation in the driving transistor Tdr, thepixel driving circuit PDC may further include at least one transistor,in addition to the sensing transistor Tsw2 and the driving transistorTdr.

To provide an additional description, the pixel driving circuit PDC mayinclude at least two transistors, for performing internal compensationor external compensation.

Here, the internal compensation may denote a method which controls avoltage at the gate electrode of the driving transistor Tdr so that acurrent supplied to the light emitting device ED is not affected by avariation of the threshold voltage or a variation of mobility even whenthe threshold voltage or mobility of the driving transistor Tdr variesdue to the degradation in the driving transistor Tdr.

The external compensation may denote a method which checks the amount ofvariation of the threshold voltage or mobility of the driving transistorTdr caused by the degradation in the driving transistor Tdr and varies alevel of the data voltage Vdata supplied through the data line DL on thebasis of the amount of variation of the threshold voltage or mobility.

FIG. 4 is an exemplary diagram illustrating a plane of a pixel drivingelectrode of a pixel included in a light emitting display panel 100according to the present disclosure, and FIG. 5 is an exemplary diagramillustrating a cross-sectional surface taken along line A-A′ illustratedin FIG. 4. Particularly, FIGS. 4 and 5 illustrate a pixel drivingelectrode AN included in one pixel.

The light emitting display panel 100 according to the presentdisclosure, as illustrated in FIGS. 3 to 5, may include a substrate 111,a pixel driving circuit PDC which includes a driving transistor Tdrdisposed on the substrate 111, a planarization layer 113 which isdisposed on the pixel driving circuit PDC, a pixel driving electrode ANwhich is disposed on the planarization layer 113 and is electricallyconnected to the driving transistor Tdr of the pixel driving circuitPDC, a light emitting layer EL which is disposed on the pixel drivingelectrode AN, and a common electrode CA which is disposed on the lightemitting layer EL.

The substrate 111 may include a plastic material or a glass material.The substrate 111 may have a flat tetragonal shape, a tetragonal shapewhere each corner portion thereof is rounded at a certain curvatureradius, or a non-tetragonal shape including at least six sides. Here,the substrate 111 having a non-tetragonal shape may include at least oneprotrusion portion or at least one notch portion.

The substrate 111 may include an opaque or colored polyimide material.For example, a substrate including a polyimide material may be formed bycuring a polyimide resin which is coated to have a certain thickness ona front surface of a release layer provided on a carrier substrate whichis relatively thick. In this case, the carrier substrate may be detachedfrom the substrate by releasing the release layer through a laserrelease process.

A back plate may be further provided on a rear surface of the substrate111. The back plate may maintain the substrate 111 in a flat state. Theback plate may include a plastic material, and for example, may includepolyethylene terephthalate. The back plate may be laminated on a rearsurface of a substrate detached from a carrier substrate.

The substrate 111 may be a flexible glass substrate. For example, thesubstrate 111 may be a thin glass substrate having a thickness of 100 μmor less, or may be a carrier glass substrate which is etched to have athickness of 100 μm or less through a substrate etching processperformed after a process of manufacturing the light emitting displaypanel 100 is completed.

The pixel driving circuit PDC may be disposed on a top surface of thesubstrate 111. The pixel driving circuit PDC may have a structuredescribed above with reference to FIG. 3, and moreover, may beconfigured as various types.

The pixel driving circuit PDC may include the driving transistor Tdrconnected to the pixel driving electrode AN. In FIG. 5, the drivingtransistor Tdr among various transistors and capacitors included in thepixel driving circuit PDC is illustrated.

The pixel driving circuit PDC, as illustrated in FIG. 5, may be providedon the substrate 111, but it not limited thereto and at least one buffermay be further disposed between the pixel driving circuit PDC and thesubstrate 111. The buffer may include various kinds of organic layers orinorganic layers.

The driving transistor Tdr may include a semiconductor layer, a sourceelectrode, a drain electrode, and a gate electrode. Also, the drivingtransistor Tdr may further include at least one insulation layer 112.

The planarization layer 113 may be disposed on the pixel driving circuitPDC. The planarization layer 113 may be disposed on the substrate 111 tocover the pixel driving circuit PDC, and thus, a flat surface may beprovided on the pixel driving circuit PDC.

A light emitting device ED may be disposed on the planarization layer113. The light emitting device ED may include the pixel drivingelectrode AN electrically connected to the driving transistor Tdr, thelight emitting layer EL disposed on the pixel driving electrode AN, andthe common electrode CA disposed on the light emitting layer EL.

The pixel driving electrode AN may be an anode. The pixel drivingelectrode AN may be disposed in an opening region of a pixel 110 and maybe electrically connected to the driving transistor Tdr included in thepixel driving circuit PDC.

The pixel driving electrode AN may include a metal material which ishigh in reflectance. For example, the pixel driving electrode AN mayinclude a multi-layer structure such as a stacked structure (Ti/Al/Ti)of aluminum (Al) and titanium (Ti), a stacked structure (ITO/Al/ITO) ofAl and indium tin oxide (ITO), an APC alloy (Ag/Pd/Cu) of silver (Ag),palladium (Pd), and copper (Cu), or a stacked structure (ITO/APC/ITO) ofan APC alloy and ITO, or may include a single-layer structure includingone material or two or more alloy materials selected from among Ag, Al,molybdenum (Mo), gold (Au), magnesium (Mg), calcium (Ca), and barium(Ba).

An edge of the pixel driving electrode AN, as illustrated in FIG. 5, maybe covered by a bank 114. The bank 114 may be disposed in a region,other than an opening region, of the pixel 110 to overlap the edge ofthe pixel driving electrode AN. Accordingly, the opening region of thepixel 110 may be defined by an opening portion of the bank 114.

Based on the bank 114, the opening region of the pixel 110 may bedefined as a pentile structure or a stripe structure.

The light emitting layer EL may be formed in all of a display area AA ofthe substrate 111 to cover the pixel driving electrode AN and the bank114.

The light emitting layer EL may include two or more light emitting partsfor emitting white light. For example, the light emitting layer EL mayinclude a first light emitting part and a second light emitting part foremitting white light on the basis of a combination of first light andsecond light. Here, the first light emitting part may emit the firstlight and may include one of a blue light emitting part, a green lightemitting part, a red light emitting part, a yellow light emitting part,and a yellowish green light emitting part. The second light emittingpart may include a light emitting part, emitting the second light havinga complementary color relationship with the first light, among the bluelight emitting part, the green light emitting part, the red lightemitting part, the yellow light emitting part, and the yellowish greenlight emitting part.

The light emitting layer EL may include one of the blue light emittingpart, the green light emitting part, and the red light emitting part,for emitting colored light corresponding to a color set in the pixel110.

The light emitting layer EL may include one of an organic light emittinglayer, an inorganic light emitting layer, and a quantum dot lightemitting layer, or may include a stacked or combination structure of anorganic light emitting layer (or an inorganic light emitting layer) anda quantum dot light emitting layer.

The common electrode CA may be formed to be electrically connected tothe light emitting layer EL. The common electrode CA may be formed inall of the display area AA of the substrate 111 so as to be connected toa plurality of light emitting layers EL provided in each pixel 110.

The common electrode CA may include a transparent conductive material ora semi transmissive conductive material for transmitting light. When thecommon electrode CA includes a semi transmissive conductive material,the emission efficiency of light emitted from the light emitting deviceED through a micro-cavity may increase. For example, the semitransmissive conductive material may include Mg, Ag, or an alloy of Mgand Ag. A capping layer for adjusting a refractive index of the lightemitted from the light emitting device ED to enhance the emissionefficiency of the light may be further formed on the common electrodeCA.

An encapsulation layer may be disposed on the common electrode CA.

The pixel driving electrode AN, as illustrated in FIGS. 4 and 5, mayinclude a plurality of first electrodes 150 apart from one another and asecond electrode 160 which covers the first electrodes 150.

At least one of the second electrode 160 and the first electrodes 150may be connected to the pixel driving circuit PDC.

For example, referring to FIG. 4, one of the first electrodes 150 may bedirectly connected to the driving transistor Tdr. However, the presentdisclosure is not limited thereto. For example, the second electrode 160may be directly connected to the driving transistor Tdr.

Hereinafter, for convenience of description, a light emitting displaypanel 100 where one of the first electrodes 150 is directly connected tothe driving transistor Tdr will be described as an example of thepresent disclosure.

A shape of each of the first electrodes 150, as illustrated in FIG. 4,may be tetragonal. However, the present disclosure is not limitedthereto, and in other embodiments, each of the first electrodes 150 mayhave various shapes such as a circular shape and a hexagonal shape.

The first electrodes 150 may be provided on the planarization layer 113and may be disposed apart from one another.

As described above, one of the first electrodes 150 may be electricallyconnected to the driving transistor Tdr.

The first electrodes 150 may perform a function of a reflector whichreflects light, emitted from the light emitting layer EL, in a directiontoward the common electrode CA. Therefore, the first electrodes 150 mayinclude a metal material which is high in reflectance, and for example,may include a multi-layer structure such as a stacked structure(Ti/Al/Ti) of Al and Ti or an APC alloy (Ag/Pd/Cu) or may include onematerial or two or more alloy materials selected from among Ag, Al, Mo,Au, Mg, Ca, and Ba.

However, the first electrodes 150 may include transparent metal such asITO and indium zinc oxide (IZO).

The second electrode 160 may be included in the pixel to cover all ofthe first electrodes 150. Accordingly, the second electrode 160 may beelectrically connected to the driving transistor Tdr.

The first electrodes 150, which are apart from one another and areelectrically insulated from one another, may be electrically connectedto one another by the second electrode 160.

The first electrodes 150 disposed apart from one another on theplanarization layer 113 may be electrically connected to one anotherthrough the second electrode 160. Accordingly, the first electrodes 150disposed apart from one another may be electrically connected to thedriving transistor Tdr through the second electrode 160.

The second electrode 160 may include a 2-1^(th) electrode 161 providedon the planarization layer 113 and a 2-2^(th) electrode 162 provided onthe first electrode 150.

The 2-2^(th) electrode 162 may be disposed to overlap the firstelectrode 150, and the 2-1^(th) electrode 161 may be disposed betweenthe first electrodes 150. The 2-1^(th) electrode 161 and the 2-2thelectrode 162 may be connected to each other at a side surface of thefirst electrode 150.

The second electrode 160 may also include the same material as that ofthe first electrode 150, but is not limited thereto and may includetransparent metal such as ITO or IZO. That is, the second electrode 160may include at least one of opaque metal, semi-transparent metal, andtransparent metal.

Referring to FIG. 5, a trench TC may be formed between the firstelectrodes 150 disposed apart from one another. The 2-1^(th) electrode161 may be disposed to correspond to the trench TC.

The 2-2^(th) electrode 161 provided on the first electrode 150 and the2-1^(th) electrode 161 provided in the trench TC may be connected toeach other at a side surface of the first electrode 150.

When a particle is not in the pixel 110 (particularly, the lightemitting device ED), a cross-sectional surface of the light emittingdisplay panel 100 may have a structure illustrated in FIG. 5.

FIG. 6 is an exemplary diagram illustrating a cross-sectional surface ofa light emitting display panel according to the present disclosure in amanufacturing process, and particularly, illustrates a cross-sectionalsurface including a particle. FIGS. 7A to 7C are exemplary diagramsillustrating a cross-sectional surface taken along line B-B′ of FIG. 4.

In a process of manufacturing the light emitting display panel 100, aparticle PA may be provided on the light emitting display panel 100 dueto several causes.

When the particle PA is provided on the light emitting display panel100, various defects may occur due to the particle PA.

When the particle PA is provided on a top surface of the pixel drivingelectrode AN in manufacturing the light emitting display panel 100, adefect may occur where the pixel driving electrode AN with the particlePA provided thereon is electrically connected to the common electrodeCA. Also, the defect may largely decrease the quality of the lightemitting display panel 100.

For example, as illustrated in FIG. 6, in a state where the particle PAis provided on the pixel driving electrode AN, when the light emittinglayer EL is deposited on the pixel driving electrode AN, the lightemitting layer EL may not be deposited on a lower region Y of theparticle PA. Accordingly, the second electrode 160 of the pixel drivingelectrode AN may be exposed at the lower region Y of the particle PA. Inthis case, the light emitting layer EL may be deposited on a top surfaceof the particle PA.

In a state where the second electrode 160 is exposed at the lower regionY of the particle PA, when the common electrode CA is deposited on a topsurface of the light emitting layer EL, the common electrode CA may beelectrically connected to the second electrode 160 at the lower regionof the particle PA.

When the second electrode 160 included in one pixel 110 is electricallyconnected to the common electrode CA connected to all pixels 110 incommon, as illustrated in FIG. 6, a defect may occur in other pixels 110as well as the pixel 110 including the second electrode 160.

Therefore, when a defect illustrated in FIG. 6 occurs, a repair processor an aging process illustrated in FIGS. 7A to 7C may be performed.

The trench TC which is recessed may be formed between the firstelectrodes 150, and the first electrodes 150 may be electricallyconnected to each other by the 2-1^(th) electrode 161 provided in thetrench TC. Also, a thickness of the 2-1^(th) electrode 161 may be lessthan that of the first electrode 150.

Because a thickness of the 2-1^(th) electrode 161 is relatively lessthan that of the first electrode 150, the 2-1^(th) electrode 161 may beeasily removed from the trench TC.

For example, as illustrated in FIGS. 4 and 7A, a through hole X passingthrough the common electrode CA, the light emitting layer EL, and the2-1^(th) electrode 161 may be formed by performing an etching process onthe trench TC near a first electrode (hereinafter simply referred to asa first particle electrode 150 a) with the particle PA provided thereon.The planarization layer 113 may be exposed through the through hole X.

The through hole X may be formed by the above-described etching process(for example, a wet etching process, a dry etching process, or a dry andwet etching process).

Moreover, the through hole X may be formed by a cutting process using alaser.

Moreover, the through hole X may be formed by a heating process.

For example, as illustrated in FIG. 6, in a case where a dark spotoccurs due to the short circuit of the pixel driving electrode AN andthe common electrode CA, when a voltage is applied, Joule's heat maylocally occur near the particle PA. When heat caused by Joule's heat isdiffused to a periphery of the particle PA, the heat may concentrate onthe 2-1^(th) electrode 161 which is disposed in the trench TC and has arelatively thin thickness, and thus, melting may occur. Accordingly, asillustrated in FIGS. 7A to 7C, the 2-1^(th) electrode 161 may bedisconnected in the trench TC.

In this case, as illustrated in FIG. 7A, all of the 2-1^(th) electrode161, the light emitting layer EL, and the common electrode CA may bedisconnected due to Joule's heat. Alternatively, as illustrated in FIG.7B, only the 2-1^(th) electrode 161 may be disconnected. Alternatively,as illustrated in FIG. 7C, only the 2-1^(th) electrode 161 and the lightemitting layer EL may be disconnected.

Therefore, at least one first electrode (hereinafter simply referred toas a first particle electrode 150 a) of the first electrodes 150 may bedisconnected from the second electrode 160 disposed between other firstelectrodes (hereinafter simply referred to as a first normal electrode150 b) surrounding the at least one first electrode (the first particleelectrode 150 a). For example, the 2-1^(th) electrode 161 correspondingto a region with the particle PA provided therein may be divided fromthe second electrode 160. Referring to FIG. 4, a second electrode(hereinafter simply referred to as a second particle electrode 160 a) ofa region corresponding to the first particle electrode 150 a may bedisconnected from a portion (hereinafter simply referred to as a secondnormal electrode 160 b), other than the second particle electrode 160 a,of the second electrode 160.

Although the 2-1^(th) electrode 161 corresponding to a region with theparticle PA provided therein is divided from the second electrode 160,first electrodes 150 corresponding to a region where the particle PA isnot provided may be covered by the second electrode 160, and thus, thesame pixel driving voltage may be supplied to the first electrodes 150.Therefore, because only a first electrode 150 corresponding to theregion with the particle PA provided therein is divided from the firstelectrodes 150, the pixel driving voltage may not be supplied theretoand may be supplied to the first electrodes 150 corresponding to theregion where the particle PA is not provided. Accordingly, even when theparticle PA is provided in a manufacturing process, a whole pixel maynot be blackened, and a region where the particle PA is not provided maybe used as a pixel.

For example, the second particle electrode 160 a may be electricallydisconnected from the second normal electrode 160 b, and the secondnormal electrode 160 b may be electrically connected to first normalelectrodes 150 b including a first normal electrode connected to thedriving transistor Tdr. Also, the first particle electrode 150 a and thesecond particle electrode 160 a may not be electrically connected to thedriving transistor Tdr.

Therefore, light may not be emitted from only a portion corresponding tothe first particle electrode 150 a, and light may be emitted from otherportions corresponding to the first normal electrodes 150 b.Accordingly, the reduction in luminance may be reduced in one pixel.

To provide an additional description, a first electrode with theparticle PA provided thereon among the first electrodes 150 may bereferred to as a first particle electrode 150 a, and first electrodes,other than the first particle electrode 150 a, of the first electrodes150 may be referred to as first normal electrodes 150 b.

In this case, the first particle electrode 150 a may be electricallydisconnected from the first normal electrodes 150 b.

Moreover, a portion, disposed at an upper end of the first particleelectrode 150 a, of the second electrode 160 may be referred to as asecond particle electrode 160 a, and the other portion, except thesecond particle electrode 160 a, of the second electrode 160 may bereferred to as a second normal electrode 160 b.

In this case, the second particle electrode 160 a may be disconnectedfrom the second normal electrode 160 b, between the first particleelectrode 150 a and the first normal electrodes 150 b.

The second normal electrode 160 b and one of the first normal electrodes150 b may be connected to the driving transistor Tdr and the firstnormal electrodes 150 b may be covered by the second normal electrode160 b, and thus, light may not be emitted from only a portioncorresponding to the first particle electrode 150 a and light may beemitted from the other portions corresponding to the first normalelectrodes 150 b. Accordingly, a reduction in luminance may be reducedin one pixel.

FIG. 8 is an exemplary diagram illustrating a connection structurebetween a 2-1^(th) electrode and a 2-2^(th) electrode in a lightemitting display panel according to the present disclosure, and FIG. 9is an exemplary diagram illustrating a method of forming an undercutregion in a light emitting display panel according to the presentdisclosure. Particularly, FIG. 8 illustrates a 2-1^(th) electrode 161and a 2-2^(th) electrode 162 which are connected to each other through afirst electrode 150. Hereinafter, descriptions which are the same as orsimilar to descriptions given above with reference to FIGS. 1 to 7C areomitted or will be briefly given.

The 2-1^(th) electrode 161 and the 2-2^(th) electrode 162, asillustrated in FIG. 5, may be connected to each other at a side surfaceof the first electrode 150.

However, as illustrated in FIG. 8, the 2-1^(th) electrode 161 and the2-2^(th) electrode 162 may be connected to each other through the firstelectrode 150.

To this end, as illustrated in FIG. 8, each of a plurality of firstelectrodes 150 may include a 1-1^(th) electrode 151 provided on aplanarization layer 113 and a 1-2^(th) electrode 152 provided at anupper end of the 1-1^(th) electrode 151. In this case, the secondelectrodes 160 may include a 2-1^(th) electrode 161 provided on theplanarization layer 113 and a 2-2^(th) electrode 162 provided at anupper end of the 1-2^(th) electrode 152. The 1-1^(th) electrode 151 mayinclude Mo, and the 1-2^(th) electrode 152 may include ITO. In addition,the 1-1^(th) electrode 151 and the 1-2^(th) electrode 152 may includevarious metal materials.

In this case, the 2-1^(th) electrode 161 and the second 2-2^(th)electrode 162 may be connected to each other through the first electrode150.

That is, the 2-1^(th) electrode 161 may be connected to the 1-1^(th)electrode 151, and the 2-2^(th) electrode 162 may be connected to the1-2^(th) electrode 152. Therefore, the 2-1^(th) electrode 161 and thesecond 2-2^(th) electrode 162 may be connected to each other through1-1^(th) electrode 151 and the 1-2^(th) electrode 152.

Particularly, a side surface of the 2-1^(th) electrode 161 may beconnected to a side surface of the 1-1^(th) electrode 151.

Therefore, as illustrated in FIG. 8, an undercut region UC having anundercut structure may be formed at a portion at which the 2-1^(th)electrode 161 is adjacent to the second 2-2^(th) electrode 162.

A method of forming the undercut region UC will be briefly describedbelow with reference to FIGS. 9A to 9C.

First, a material included in the 1-1^(th) electrode 151 may bedeposited on a whole upper end of the planarization layer 113, amaterial included in the 1-2^(th) electrode 152 may be deposited on theupper end subsequently, and the 1-2^(th) electrode 152 may be patternedsubsequently.

Subsequently, as illustrated in FIG. 9A, a photoresist PR may be coatedon an upper end of the 1-2^(th) electrode 152, and based on thephotoresist PR, as illustrated in FIG. 9B, the 1-1^(th) electrode 151may be formed. In this case, an undercut structure may be formed at anend of each of the 1-1^(th) electrode 151 and the 1-2^(th) electrode152.

Finally, as illustrated in FIG. 9C, a second electrode 160 may bedeposited on an upper end of the 1-2^(th) electrode 152 and theplanarization layer 113.

In this case, the 2-1^(th) electrode 161, formed on the planarizationlayer 113, of the second electrode 160 may be electrically connected toa side surface of the 1-1^(th) electrode 151. Accordingly, the undercutregion UC illustrated in FIG. 8 and FIG. 9C may be formed.

FIG. 10 is an exemplary diagram illustrating a structure where a2-1^(th) electrode and a 2-2^(th) electrode are electricallydisconnected from each other by a repair process or an aging process, ina light emitting display panel according to the present disclosure.

As described above, a thickness of the 2-1^(th) electrode 161 may berelatively less than that of the first electrode 150, and thus, the2-1^(th) electrode 161 disposed in a trench TC may be easily removed.

Particularly, the 2-1^(th) electrode 161 may be formed in the undercutregion UC in the trench TC. Also, a thickness of the 2-1^(th) electrode161 formed in the undercut region UC may be thinner than that of the2-1^(th) electrode 161 described above with reference to FIG. 5.

Therefore, in a case where a repair process or an aging processaccording to the present disclosure is performed, the 2-1^(th) electrode161 may be more easily removed. Also, the through hole X may be moreeasily formed.

FIG. 11 is another exemplary diagram illustrating a cross-sectionalsurface of a light emitting display panel according to the presentdisclosure, and FIGS. 12 to 14 are exemplary diagrams illustrating aprocess of manufacturing the light emitting display panel illustrated inFIG. 11. Hereinafter, descriptions which are the same as or similar todescriptions given above with reference to FIGS. 1 to 10 are omitted orwill be briefly given.

As described above, a pixel driving electrode AN may include a pluralityof first electrodes 150 apart from one another and a second electrode160 which covers the first electrodes 150.

In this case, as illustrated in FIG. 6, when a particle PA is disposedon the pixel driving electrode AN, a repair process or an aging processdescribed above with reference to FIGS. 7A to 7C may be performed.

However, in the present disclosure, when the particle PA is disposed atan upper end of the pixel driving electrode AN, a repair process or anaging process described below may be performed, and finally, a lightemitting display panel 100 according to the present disclosureillustrated in FIG. 11 may be manufactured.

In the light emitting display panel 100 according to the presentdisclosure, the particle PA may be provided at an upper end of thesecond electrode 160, a material included in a light emitting layer ELmay be provided at an upper end of the particle PA, a particle coverlayer PCL may be provided near a lower end Y of the particle PA, theparticle cover layer PCL may be surrounded by the light emitting layerEL, and a common electrode CA may be provided at an upper end of each oflight emitting layer EL, the particle cover layer PCL, and the particlePA. In this case, a material having hydrophobicity like fluorine mayremain on an uppermost end of the light emitting layer EL, or a materialhaving hydrophobicity may be removed together with a below-describedparticle cover material PCM in a process of removing the particle covermaterial PCM.

A process of manufacturing the light emitting display panel 100according to the present disclosure will be described below.

First, as illustrated in FIG. 12, in a state where the particle PA isplaced at an upper end of the pixel driving electrode AN (particularly,the second electrode 160), the light emitting layer EL may be formed onthe upper end of each of the second electrode 160 and the particle PA.

Subsequently, as illustrated in FIG. 12, a material havinghydrophobicity (hereinafter simply referred to as a hydrophobic materialHM) (for example, fluorine) may be coated on an uppermost end of thelight emitting layer EL. Hydrophobicity may denote a feature which isnot good in bonding force to water.

Subsequently, as illustrated in FIG. 13, the particle cover material PCMmay be coated on an upper end of the hydrophobic material HM by using asoluble process. The particle cover material PCM may be one of materialswhich are not bonded to the hydrophobic material HM and are well bondedto a metal material such as the pixel driving electrode AN.

Subsequently, as illustrated in FIG. 14, when the particle covermaterial PCM is removed at an appropriate level through a spin coatingprocess, the particle cover material PCM may be removed from an upperportion of the light emitting layer EL having hydrophobicity, and theparticle cover material PCM may remain on only the lower end Y of theparticle PA at which the second electrode 160 is exposed. The particlecover material PCM remaining on the lower end Y of the particle PA maybe referred to as a particle cover layer PCL. In this case, when theparticle cover material PCM is removed, the hydrophobic material HMformed at an upper end of the light emitting layer EL may be removedtogether with the particle cover material PCM, or may remain.

Finally, the particle cover layer PCL may be cured at a level forreducing damage from occurring in the light emitting layer EL, and then,when the common electrode CA is deposited thereon, the light emittingdisplay panel illustrated in FIG. 11 may be formed.

In this case, the common electrode CA may be deposited in a state wherethe second electrode 160 exposed at the lower end Y of the particle PAis covered by the particle cover layer PCL, and thus, the commonelectrode CA and the second electrode 160 may not electrically beconnected to each other at the lower end Y of the particle PA.

Therefore, a defect where the common electrode CA is short-circuitedwith the pixel driving electrode AN may not occur based on the particlePA.

FIG. 15 is another exemplary diagram illustrating a cross-sectionalsurface of a light emitting display panel according to the presentdisclosure. Hereinafter, descriptions which are the same as or similarto descriptions given above with reference to FIGS. 11 to 14 are omittedor will be briefly given.

As described above, when the common electrode CA is deposited in a statewhere the second electrode 160 exposed at the lower end Y of theparticle PA is covered by the particle cover layer PCL, the commonelectrode CA and the second electrode 160 may not electrically beconnected to each other at the lower end Y of the particle PA.Therefore, a defect where the common electrode CA is short-circuitedwith the pixel driving electrode AN may not occur based on the particlePA.

In this case, as illustrated in FIGS. 11 to 14, the pixel drivingelectrode AN may include a plurality of first electrodes 150 and asecond electrode 160 which covers the first electrodes 150.

However, as illustrated in FIG. 15, the pixel driving electrode AN maybe configured in a plate shape. In this case, the pixel drivingelectrode AN may be formed of at least one layer by using variousmaterials described above. In FIG. 15, the pixel driving electrode ANincluding only the second electrode 160 is illustrated.

The light emitting display panel according to the present disclosure mayinclude a substrate 111, a pixel driving circuit PDC disposed on thesubstrate 111, a planarization layer 113 disposed at an upper end of thepixel driving circuit PDC, a pixel driving electrode AN which isdisposed at an upper end of the planarization layer 113 and iselectrically connected to the pixel driving circuit PDC, a lightemitting layer EL disposed at an upper end of the pixel drivingelectrode AN, and a common electrode CA disposed at an upper end of thelight emitting layer EL. In this case, a particle PA may be provided atthe upper end of the pixel driving electrode AN, a material included inthe light emitting layer EL may be provided at an upper end of theparticle PA, a particle cover layer PCL may be provided near a lower endY of the particle PA, the particle cover layer PCL may be surrounded bythe light emitting layer EL, and a common electrode CA may be providedon an upper end of each of light emitting layer EL, the particle coverlayer PCL, and the particle PA.

In a case where the particle PA is provided on the pixel drivingelectrode AN formed in a plate shape, processes described above withreference to FIG. 12 may be performed.

Therefore, the common electrode CA and the second electrode 160 may notelectrically be connected to each other at the lower end Y of theparticle PA. Therefore, a defect where the common electrode CA isshort-circuited with the pixel driving electrode AN may not occur basedon the particle PA.

Hereinafter, features of the present disclosure described above will bedescribed.

First, in the present disclosure, as described above with reference toFIGS. 1 to 7C, a trench TC structure may be formed in the pixel drivingelectrode AN.

When the pixel driving electrode AN is formed on the planarization layer113, each of the first electrodes 150 may be used as a reflector, and asthe first electrodes 150 are separated from one another by a minimumline width, the trench TC structure may be formed.

The second electrode 160 including transparent metal such as ITO may beformed on the first electrodes 150 and the planarization layer 113 tohave a thickness of tens nm.

The first electrodes 150 may be separated from one another, and thefirst electrodes 150 may be electrically connected to one another by thesecond electrode 160.

According to the present disclosure, in a light emitting display panelbased on a top emission type, defects caused by an initial dark spot anda progressive dark spot may be reduced.

To provide an additional description, in the present disclosure, thefirst electrodes 150 which configure the pixel driving electrode AN andare used as reflectors may be divided into a plurality of electrodes toform a trench structure, and Joule's heat may occur in a portion whereshort circuit between the pixel driving electrode AN and the commonelectrode CA occurs due to a particle. ITO (i.e., the 2-1^(th) electrode161) of a local region may be disconnected due to Joule's heat, andthus, only a region with the particle PA disposed therein may beblackened in one pixel and the other regions may normally emit light.

In the related art, when a defect caused by a particle occurs, a methodof short-circuiting a common electrode (i.e., a cathode) is applied.However, in the present disclosure, all of the pixel driving electrodeAN, the light emitting layer EL, and the common electrode CA may be cut,thereby reducing the occurrence of a progressive dark spot.

Therefore, according to the present disclosure, a yield rate of a lightemitting display panel based on the top emission type may be enhanced,and defects caused by an initial dark spot and a progressive dark spotmay be reduced.

Subsequently, in the present disclosure, as described above withreference to FIGS. 8 to 10, an undercut structure may be formed in thepixel driving electrode AN.

The first electrode 150 may include a 1-1^(th) electrode 151 and a1-2^(th) electrode 152, and a reverse tapered structure or an undercutstructure where the 1-1^(th) electrode 151 is formed inward from the1-2^(th) electrode 152 may be formed at an end of each of the first1-1^(th) electrode 151 and the 1-2^(th) electrode 152.

To provide an additional description, the first electrode 150 mayinclude the 1-1^(th) electrode 151 including Mo and the 1-2^(th)electrode 152 including ITO, and an undercut structure may be formedbased on the first 1-1^(th) electrode 151 and the 1-2^(th) electrode152.

In this case, in an undercut region UC with the undercut structureprovided therein, a 2-1^(th) electrode 161 and a 2-2^(th) electrode 162configuring the second electrode 160 may be apart from each other, andparticularly, a thickness of the 2-1^(th) electrode 161 provided in theundercut region UC may be formed to be thinner than that of the 2-1^(th)electrode 161 provided in a region other than the undercut region UC.

Therefore, based on the undercut structure, the 2-1^(th) electrode 161may be more easily cut. The 2-1^(th) electrode 161 may be cut by usingheat caused by Joule's heat as described above.

Finally, in the present disclosure, as described above with reference toFIGS. 11 to 15, a particle cover layer PCL may be formed in amanufacturing process.

The pixel driving electrode AN disposed at a lower end Y of the particlePA may be covered by the particle cover layer PCL, and thus, a defectwhere the common electrode CA is short-circuited with the pixel drivingelectrode AN at the lower end Y of the particle PA may not occur.

To this end, a material having hydrophobicity (a hydrophobic materialHM) may be formed at an uppermost end of the light emitting layer EL.The hydrophobic material HM may use fluorine. That is, a fluorine-basedmaterial may be a stable material, and thus, may have a characteristicwhich is not bonded to another material.

A particle cover material PCM may be formed at an upper end of thehydrophobic material HM through a soluble process, and based on a spincoating process, a portion at which the pixel driving electrode ANdisposed at the lower end Y of the particle PA is exposed may be filledby the particle cover layer PCL, and thus, short circuit between thepixel driving electrode AN and the common electrode CA may be reduced.

In the present disclosure using such a method, unlike an aging processusing Joule's heat, short circuit between the pixel driving electrode ANand the common electrode CA may be fundamentally reduced. Accordingly,according to the present disclosure, a yield rate of a light emittingdisplay panel based on the top emission type may be enhanced.

To provide an additional description, an organic layer componentgenerated after an adhesive and functional (AF) part is deposited may bean AF over-coating layer, and an over-coating layer may have fluiditybecause bonding is unstable. Accordingly, the particle cover layer PCLmay be deposited on only the lower end Y of the particle PA where thehydrophobic material HM is insufficient or is not provided, and thepixel driving electrode AN exposed at the lower end Y may be covered bythe particle cover layer PCL.

FIGS. 16 and 17 are other exemplary diagrams illustrating a plane of apixel driving electrode of a pixel included in a light emitting displaypanel according to the present disclosure. FIGS. 18A to 18C areexemplary diagrams illustrating a cross-sectional surface taken alongline C-C′ illustrated in FIG. 16. FIG. 19 is an exemplary diagramillustrating a connection relationship between a pixel driving circuitand a light emitting device when particles are in a pixel of a lightemitting display panel according to the present disclosure.Particularly, FIGS. 18A to 18C illustrate a pixel driving electrode ANincluded in one pixel. Hereinafter, descriptions which are the same asor similar to descriptions given above with reference to FIGS. 1 to 15are omitted or will be briefly given. In the following description,elements which perform the same functions as those of the elementsdescribed above with reference to FIGS. 1 to 15 are referred to by likereference numerals applied to FIGS. 1 to 15.

As described above, a light emitting display panel 100 according to thepresent disclosure may include a substrate 111, a pixel driving circuitPDC which includes a driving transistor Tdr disposed on the substrate111, a planarization layer 113 which is disposed on the pixel drivingcircuit PDC, a pixel driving electrode AN which is disposed on theplanarization layer 113 and is electrically connected to the drivingtransistor Tdr of the pixel driving circuit PDC, a light emitting layerEL which is disposed on the pixel driving electrode AN, and a commonelectrode CA which is disposed on the light emitting layer EL. The pixeldriving electrode AN may include a plurality of first electrodes 150disposed apart from one another and a second electrode 160 formed tocover the plurality of first electrodes 150. The second electrode 160may electrically connect the plurality of first electrodes 150 apartfrom one another.

Referring to FIG. 16, the first electrode 150 may include a connectionelectrode 153 connected to the driving transistor Tdr and a plurality ofdivision electrodes 154 apart from one another.

In the light emitting display panel illustrated in FIG. 4, a firstelectrode connected to the driving transistor Tdr among the firstelectrodes 150 may be connected to the connection electrode 153, and theother first electrodes may be the division electrodes 154.

In this case, as illustrated in FIG. 4, a shape of the connectionelectrode 153 may be the same as or similar to that of each of thedivision electrodes 154. Alternatively, as illustrated in FIG. 16, ashape of the connection electrode 153 may differ from that of each ofthe division electrodes 154.

For example, as illustrated in FIG. 16, the division electrodes 154 maybe formed in a tetragonal shape, and the connection electrode 153 may beformed in a linear shape.

The connection electrode 153 may be formed to have a shape which differsfrom that of each of the division electrodes 154. For example, a widthW1 of the connection electrode 153 may be set to be less than a width W2of the division electrode 154. Also, a length L1 of the connectionelectrode 153 may be set to be longer than a length L2 of the divisionelectrode 154.

The connection electrode 153 may be formed in a first direction (forexample, a direction parallel to a data line) of the light emittingdisplay panel 100. For example, referring to FIG. 16, the connectionelectrode 153 may extend in a lengthwise direction of a pixel 110, andthe data line may extend in the lengthwise direction of the pixel 110.However, the present disclosure is not limited thereto. For example, theconnection electrode 153 may extend in a direction vertical to the dataline. Therefore, the connection electrode 153 may extend in a widthwisedirection of a pixel 110.

The connection electrode 153 may be formed in a linear shape whichextends in the first direction of the light emitting display panel 100.The first direction may be one of various directions which may be formedon a plane of the light emitting display panel 100. For example, thefirst direction may be a lengthwise direction, or may be a widthwisedirection.

At least two division electrodes 154 may face the connection electrode153 in the lengthwise direction of the connection electrode 153.

In the pixel 110 illustrated in FIG. 16, the plurality of divisionelectrodes 154 may be provided in a direction in which the connectionelectrode 153 extends. The connection electrode 153 may be formed toextend in a lengthwise direction thereof. Also, the plurality ofdivision electrodes 154 facing the connection electrode 153 may beprovided on one side of the connection electrode 153 extending in thelengthwise direction.

Moreover, in a pixel 110 illustrated in FIG. 17, a plurality of divisionelectrodes 154 may be provided in a lengthwise direction of a connectionelectrode 153. A plurality of division electrodes 154 facing theconnection electrode 153 may be respectively provided at one side andthe other side of the connection electrode 153 with the connectionelectrode 153 therebetween.

At least two division electrodes 154 may face the connection electrode153 in the lengthwise direction of the connection electrode 153.Alternatively, at least two division electrodes 154 may be respectivelyprovided at both sides of the connection electrode 153 with theconnection electrode 153 therebetween to face the connection electrode153.

Moreover, in the pixel 110 illustrated in FIG. 17, a same number ofdivision electrodes 154 may be provided at one side and the other sidewith respect to the connection electrode 153, but the number of divisionelectrodes 154 provided at one side of the connection electrode 153 maydiffer from the number of division electrodes 154 provided at the otherside of the connection electrode 153.

A position of the connection electrode 153 may be variously changed inthe pixel 110.

The division electrodes 154, as illustrated in FIG. 16, may be formed ina tetragonal plate shape. However, the present disclosure is not limitedthereto. For example, the division electrodes 154 may be formed in apolygonal shape such as a triangular shape, a pentagonal shape, or ahexagonal shape, in addition to a tetragonal shape. Alternatively, thedivision electrode 154 may be formed in various shapes where sidesthereof have different lengths.

Moreover, shapes of the division electrodes 154 may be the same, but maydiffer. Also, sizes of the division electrodes 154 may be the same, butmay differ.

Referring to FIGS. 16 and 17, a width W1 of the connection electrode 153may be set to be less than a width W2 of each of the division electrodes154. Accordingly, a probability that a particle PA is provided in theconnection electrode 153 may decrease.

The width W1 of the connection electrode 153 may be set to be less thanthe width W2 of each of the division electrodes 154, and thus, thepossibility that the particle PA is provided in at least one of thedivision electrodes 154 instead of the connection electrode 153 may behigh.

For example, as illustrated in FIGS. 18A to 18C, a division electrode154 (hereinafter referred to as a first particle electrode 150 a) wherethe particle PA occurs may be electrically disconnected from divisionelectrodes 154 (hereinafter referred to as a first normal electrode 150b) where the particle PA does not occur, based on an aging process.Accordingly, the pixel 110 may normally emit light by using the firstnormal electrodes 150 b and the second normal electrode 160 b.

That is, a through hole X illustrated in FIG. 18A may be formed by anetching process (for example, a wet etching process, a dry etchingprocess, or a dry and wet etching process). However, the presentdisclosure is not limited thereto. For example, the etching process mayinclude a cutting process using a laser, or may include a heatingprocess.

For example, in a case where the through hole X is formed through aheating process using Joule's heat, as illustrated in FIG. 18A, all ofthe 2-1^(th) electrode 161, the light emitting layer EL, and the commonelectrode CA may be disconnected. Also, as illustrated in FIG. 18B, onlythe 2-1^(th) electrode 161 may be disconnected. Alternatively, asillustrated in FIG. 18C, only the 2-1^(th) electrode 161 and the lightemitting layer EL may be disconnected.

As illustrated in FIGS. 18A to 18C and 19, light may not be emitted froma light emitting device ED corresponding to the first particle electrode150 a which is electrically disconnected from the first normal electrode150 b and the second normal electrode 160 b, and light may be emittedfrom a light emitting device ED corresponding to the first normalelectrode 150 b.

A width of a connection electrode 153 directly connected to a drivingtransistor Tdr configuring a pixel driving circuit PDC may be set to beless than that of each of the division electrodes 154. Because the widthof the connection electrode 153 may be set to be less than that of eachof the division electrodes 154, the possibility that the particle PA isprovided on the connection electrode 153 may decrease. Also, a divisionelectrode 154 with the particle PA provided thereon may be electricallydisconnected from the other division electrodes 154 through an agingprocess. A division electrode 154 divided through an aging process maybe blackened, and based on the other division electrodes 154 which arenot divided, the pixel 110 may normally emit light.

FIG. 20 is an exemplary diagram illustrating a cross-sectional surfacetaken along line D-D′ illustrated in FIG. 16, and FIG. 21 is a plan viewof each of four pixels applied to a light emitting display panelaccording to the present disclosure. Particularly, a light blockingparticle 113 a described below with reference to FIG. 20 is illustratedin FIG. 21. A cross-sectional surface illustrated in FIG. 20 may be across-sectional surface taken along line A-A′ illustrated in FIG. 4.When the cross-sectional surface illustrated in FIG. 20 is thecross-sectional surface taken along line A-A′ illustrated in FIG. 4,three first electrodes 150 are illustrated along line A-A′ in FIG. 4,but in the following description, it may be assumed that four firstelectrodes 150 are provided. Hereinafter, descriptions which are thesame as or similar to descriptions given above with reference to FIGS. 1to 19 are omitted or will be briefly given.

A light emitting display panel 100 according to the present disclosuremay include a substrate 111, a pixel driving circuit PDC which includesa driving transistor Tdr disposed on the substrate 111, a planarizationlayer 113 which is disposed on the pixel driving circuit PDC, a pixeldriving electrode AN which is disposed on the planarization layer 113and is electrically connected to the driving transistor Tdr of the pixeldriving circuit PDC, a light emitting layer EL which is disposed on thepixel driving electrode AN, and a common electrode CA which is disposedon the light emitting layer EL. The pixel driving electrode AN mayinclude a plurality of first electrodes 150 disposed apart from oneanother and a second electrode 160 formed to cover the plurality offirst electrodes 150. Also, at least one of the second electrode 160 andthe first electrodes 150 may be connected to the pixel driving circuitPDC.

The first electrodes 150 configuring the pixel driving electrode AN maybe connected to one another, and thus, when the light emitting displaypanel 100 according to the present disclosure is the top emission type,light emitted from the light emitting layer EL may be leaked to thepixel driving circuit PDC through a gap between the first electrodes150.

Light having a short wavelength among leaked light may cause thedegradation (TFT degradation) in quality of a transistor included in thepixel driving circuit PDC. For example, light having a wavelength ofless than 500 nm among leaked light may cause the degradation (TFTdegradation) in quality of the transistor included in the pixel drivingcircuit PDC. Therefore, light which is emitted from the light emittinglayer EL and is leaked to the pixel driving circuit PDC through a gapbetween the first electrodes 150 may need to be blocked.

To this end, in the present disclosure, as illustrated in FIG. 20, anano particle or a quantum dot having a light blocking characteristic ora light scattering characteristic (hereinafter referred to as a lightblocking particle 113 a) may be provided in the planarization layer 113.The planarization layer 113 including a light blocking particle 113 amay perform a function of a light blocking layer.

Light leaked from the light emitting layer EL to the pixel drivingcircuit PDC may be blocked by the planarization layer 113 for performinga function of a light blocking layer. Because the light leaked from thelight emitting layer EL to the pixel driving circuit PDC is blocked bythe planarization layer 113 including the light blocking particle 113 a,the degradation (TFT degradation) in quality of a transistor may bereduced.

The light blocking particle 113 a included in the planarization layer113 may be a nano particle NP or a quantum dot QD including a metalmaterial such as gold or silver.

Generally, the planarization layer may be formed by coating at least one(hereinafter referred to as a planarization layer material) of anorganic material and an inorganic material. By using such a dot, thelight blocking particles 113 a having a light scattering characteristicor a light dispersion characteristic may be provided in theplanarization layer material. Alternatively, the planarization layermaterial including the light blocking particles 113 a may be coated onan upper end of the pixel driving circuit PDC, and thus, theplanarization layer 113 may be formed.

In a case where light having a specific wavelength reaches a surface ofthe light blocking particle 113 a, on the basis of a plasmon phenomenon,when the wavelength of the light matches a vibration period of plasmonof the surface of the light blocking particle 113 a, the light may beabsorbed or scattered by the surface of the light blocking particle 113a. A wavelength absorbed by the surface of the light blocking particle113 a may mainly correspond to an ultraviolet (UV) range, but the lightblocking particle 113 a may scatter or absorb a wavelength of a visiblelight range.

Therefore, light flowing into a region between the first electrodes 150may be blocked by the planarization layer 113 including the lightblocking particles 113 a.

The light blocking particles 113 a may be provided in a whole regioncorresponding to a display area AA of the substrate 111.

For example, the light blocking particles 113 a for performing a lightblocking function may be provided all over the planarization layer 113which is disposed to correspond to the display area AA.

However, the present disclosure is not limited thereto. For example, thelight blocking particles 113 a may be provided in only a region,corresponding to the pixel driving circuit PDC, of the planarizationlayer 113 included in the substrate 111.

For example, the light blocking particles 113 a may be provided in theplanarization layer 113 to cover all of the pixel driving circuit PDC.

Alternatively, the light blocking particles 113 a may be provided in theplanarization layer 113 to cover at least one of two or more transistorsincluded in the pixel driving circuit PDC.

Referring to FIG. 3, the pixel driving circuit PDC may include a drivingtransistor Tdr which is connected to the pixel driving electrode AN, aswitching transistor Tsw1 which is connected to a gate electrode of thedriving transistor Tdr, a sensing transistor Tsw2 which is connectedbetween the driving transistor Tdr and the pixel driving electrode AN,and an emission transistor Tsw3 which controls flowing of a current tothe driving transistor Tdr.

In this case, as illustrated in FIG. 20, the light blocking particles113 a provided in the planarization layer 113 for performing a lightblocking function may be provided in at least one of a region betweenthe switching transistor Tsw1 and the pixel driving electrode AN, aregion between the sensing transistor Tsw2 and the pixel drivingelectrode AN, a region between the emission transistor Tsw3 and thepixel driving electrode AN, and a region between the driving transistorTdr and the pixel driving electrode AN. Here, the pixel drivingelectrode AN may denote the first electrodes 150.

For example, as illustrated in FIG. 21, the light blocking particles 113a may be provided between the switching transistor Tsw1 and the pixeldriving electrode AN and between the sensing transistor Tsw2 and thepixel driving electrode AN.

The reason that the light blocking particles 113 a are not provided inthe planarization layer 113 disposed between the driving transistor Tdrand the pixel driving electrode AN is because the mobility of thedriving transistor Tdr is more enhanced by light leaked to a gap betweenthe first electrodes 150. Also, the reason is because the emissionefficiency of the light emitting device ED increases as the mobility ofthe driving transistor Tdr is enhanced.

However, because a characteristic of each of the switching transistorTsw1 and the sensing transistor Tsw2 should not be changed, the lightblocking particles 113 a may be provided in the planarization layer 113disposed in a region corresponding to the switching transistor Tsw1 andthe sensing transistor Tsw2.

That is, due to light leaked to a gap between the first electrodes 150,the light blocking particles 113 a may not be provided in a transistorhaving an enhanced characteristic, but due to the light leaked to thegap between the first electrodes 150, the light blocking particles 113 amay be provided in a transistor where a characteristic thereof shouldnot be changed.

FIG. 22 is another exemplary diagram illustrating a cross-sectionalsurface taken along line D-D′ illustrated in FIG. 16, and FIG. 23 isanother plan view of each of four pixels applied to a light emittingdisplay panel according to the present disclosure. Particularly, a lightblocking layer 115 described below with reference to FIG. 22 isillustrated in FIG. 23. A cross-sectional surface illustrated in FIG. 22may be a cross-sectional surface taken along line A-A′ illustrated inFIG. 4. When the cross-sectional surface illustrated in FIG. 22 is thecross-sectional surface taken along line A-A′ illustrated in FIG. 4,three first electrodes 150 are illustrated along line A-A′ in FIG. 4,but in the following description, it may be assumed that four firstelectrodes 150 are provided. Hereinafter, descriptions which are thesame as or similar to descriptions given above with reference to FIGS. 1to 19 are omitted or will be briefly given.

A light emitting display panel 100 according to the present disclosuremay include a substrate 111, a pixel driving circuit PDC which includesa driving transistor Tdr disposed on the substrate 111, a planarizationlayer 113 which is disposed on the pixel driving circuit PDC, a pixeldriving electrode AN which is disposed on the planarization layer 113and is electrically connected to the driving transistor Tdr of the pixeldriving circuit PDC, a light emitting layer EL which is disposed on thepixel driving electrode AN, and a common electrode CA which is disposedon the light emitting layer EL. The pixel driving electrode AN mayinclude a plurality of first electrodes 150 disposed apart from oneanother and a second electrode 160 formed to cover the plurality offirst electrodes 150. Also, at least one of the second electrode 160 andthe first electrodes 150 may be connected to the pixel driving circuitPDC.

The first electrodes 150 configuring the pixel driving electrode AN maybe connected to one another, and thus, when the light emitting displaypanel 100 according to the present disclosure is the top emission type,light emitted from the light emitting layer EL may be leaked to thepixel driving circuit PDC through a gap between the first electrodes150.

Light having a short wavelength among leaked light may cause thedegradation (TFT degradation) in quality of a transistor included in thepixel driving circuit PDC. For example, light having a wavelength ofless than 500 nm among leaked light may cause the degradation (TFTdegradation) in quality of the transistor included in the pixel drivingcircuit PDC. Therefore, light which is emitted from the light emittinglayer EL and is leaked to the pixel driving circuit PDC through a gapbetween the first electrodes 150 may need to be blocked.

The light emitting display panel 100 according to the presentdisclosure, as illustrated in FIG. 22, may further include a lightblocking layer 115 provided between the pixel driving circuit PDC andthe planarization layer 113, for blocking light flowing into a regionbetween the first electrodes 150.

The light blocking layer 115 may include a silicon (Si) layer or agermanium (Ge) layer. Alternatively, the light blocking layer 115 may bea combination layer including a Si layer and a Ge layer.

The Si layer included in the light blocking layer 115 may be anamorphous Si (a-Si) layer, and the Ge layer included in the lightblocking layer 115 may be an amorphous Ge (a-Ge) layer.

A transmittance of light having a short wavelength may be low in thea-Si layer and the a-Ge layer, and thus, light may be blocked by thea-Si layer and the a-Ge layer.

The light blocking layer 115 may be a multilayer including an a-Si layerand an a-Ge layer. In this case, light may be blocked due to arefractive index between the layers.

The light blocking layer 115 may be a single layer having an amorphouscharacteristic where a transmittance is low in a short wavelength range.Alternatively, the light blocking layer 115 may be formed of acombination layer including single layers having an amorphouscharacteristic.

As described above with reference to FIG. 22, light flowing into aregion between the first electrodes 150 may be blocked by a lightblocking layer 115 provided between the pixel driving circuit PDC andthe planarization layer 113.

The light blocking layer 115 provided between the pixel driving circuitPDC and the planarization layer 113 may be provided in a whole regioncorresponding to a display area AA of the substrate 111.

For example, in a case where the light blocking layer 115 is providedbetween the pixel driving circuit PDC and the planarization layer 113 soas to block light, the light blocking layer 115 may be disposed to coverall of the display area AA.

However, the present disclosure is not limited thereto. For example, thelight blocking layer 115 provided between the pixel driving circuit PDCand the planarization layer 113 may be provided in only a region,corresponding to the pixel driving circuit PDC, of the substrate 111.

For example, the light blocking layer 115 provided between the pixeldriving circuit PDC and the planarization layer 113 may cover all of thepixel driving circuit PDC.

Alternatively, the light blocking layer 115 provided between the pixeldriving circuit PDC and the planarization layer 113 for blocking lightmay be provided to cover at least one of two or more transistorsincluded in the pixel driving circuit PDC.

Referring to FIG. 3, the pixel driving circuit PDC may include a drivingtransistor Tdr which is connected to the pixel driving electrode AN, aswitching transistor Tsw1 which is connected to a gate electrode of thedriving transistor Tdr, a sensing transistor Tsw2 which is connectedbetween the driving transistor Tdr and the pixel driving electrode AN,and an emission transistor Tsw3 which controls flowing of a current tothe driving transistor Tdr.

In this case, the light blocking layer 115 provided between the pixeldriving circuit PDC and the planarization layer 113 may be provided inat least one of a region between the switching transistor Tsw1 and thepixel driving electrode AN, a region between the sensing transistor Tsw2and the pixel driving electrode AN, a region between the emissiontransistor Tsw3 and the pixel driving electrode AN, and a region betweenthe driving transistor Tdr and the pixel driving electrode AN. Here, thepixel driving electrode AN may denote the first electrodes 150.

For example, as illustrated in FIG. 23, the light blocking layer 115 maybe provided between the switching transistor Tsw1 and the pixel drivingelectrode AN and between the sensing transistor Tsw2 and the pixeldriving electrode AN.

The reason that the light blocking layer 115 is not provided in theplanarization layer 113 disposed between the driving transistor Tdr andthe pixel driving electrode AN is because the mobility of the drivingtransistor Tdr is more enhanced by light leaked to a gap between thefirst electrodes 150. Also, the reason is because the emissionefficiency of the light emitting device ED increases as the mobility ofthe driving transistor Tdr is enhanced. As described above, the lightblocking layer 115 may not be provided between the driving transistorTdr and the pixel driving electrode AN.

However, because a characteristic of each of the switching transistorTsw1 and the sensing transistor Tsw2 should not be changed, the lightblocking layer 115 may be disposed in a region corresponding to theswitching transistor Tsw1 and the sensing transistor Tsw2.

That is, due to light leaked to a gap between the first electrodes 150,the light blocking layer 115 may not be provided in a transistor havingan enhanced characteristic, but due to the light leaked to the gapbetween the first electrodes 150, the light blocking layer 115 may beprovided in a transistor where a characteristic thereof should not bechanged.

According to the embodiments of the present disclosure, only a firstelectrode corresponding to a region with particles located therein maybe electrically disconnected from a pixel driving electrode, therebypreventing each pixel from being totally blackened by the particles.

Therefore, a yield rate of a light emitting display panel may beenhanced.

Moreover, in the present disclosure, a width of a connection electrodedirectly connected to a driving transistor configuring a pixel drivingcircuit among first electrodes may be set to be less than that ofdivision electrodes. Also, a length of the connection electrode may beset to be long like a line, and thus, possibility that particles areprovided on the connection electrode may be reduced. In this case, adivision electrode with particles located thereon may be electricallydisconnected from the other division electrodes by an aging process, andthus, a pixel may normally emit light by using the other divisionelectrodes.

Moreover, in the present disclosure, light leaked from a light emittinglayer to the pixel driving circuit through a gap between the firstelectrodes may be blocked by a light blocking layer, thereby reducingthe quality degradation of a transistor due to leakage light.

The above-described feature, structure, and effect of the presentdisclosure are included in at least one embodiment of the presentdisclosure, but are not limited to only one embodiment. Furthermore, thefeature, structure, and effect described in at least one embodiment ofthe present disclosure may be implemented through combination ormodification of other embodiments by those skilled in the art.Therefore, content associated with the combination and modificationshould be construed as being within the scope of the present disclosure.

It will be apparent to those skilled in the art that variousmodifications and variations can be made in the present disclosurewithout departing from the spirit or scope of the disclosures. Thus, itis intended that the present disclosure covers the modifications andvariations of this disclosure provided they come within the scope of theappended claims and their equivalents.

What is claimed is:
 1. A light emitting display panel comprising: asubstrate; a pixel driving circuit disposed on the substrate; aplanarization layer disposed on the pixel driving circuit; a pixeldriving electrode disposed on the planarization layer, the pixel drivingelectrode electrically connected to the pixel driving circuit; a lightemitting layer disposed on the pixel driving electrode; and a commonelectrode disposed on the light emitting layer, wherein the pixeldriving electrode comprises: a plurality of first electrodes spacedapart from one another; and a second electrode covering the plurality offirst electrodes, and at least one of the second electrode or theplurality of first electrodes is connected to the pixel driving circuit.2. The light emitting display panel of claim 1, wherein the secondelectrode comprises: a 2-1^(th) electrode disposed on the planarizationlayer; and a 2-2^(th) electrode disposed on a first electrode from theplurality of first electrodes, and the 2-1^(th) electrode and the2-2^(th) electrode are connected to each other at a side surface of thefirst electrode.
 3. The light emitting display panel of claim 1, whereinat least one of the plurality of first electrodes is disconnected fromthe second electrode, disposed between other first electrodes from theplurality of first electrodes, the other first electrodes surroundingthe at least one of the plurality of first electrodes.
 4. The lightemitting display panel of claim 1, wherein each of the plurality offirst electrodes comprises: a 1-1^(th) electrode disposed on theplanarization layer; and a 1-2^(th) electrode disposed on the 1-1^(th)electrode, wherein the second electrode comprises: a 2-1^(th) electrodedisposed on the planarization layer; and a 2-2^(th) electrode disposedon the 1-2^(th) electrode, and the 2-1^(th) electrode is connected tothe 2-2^(th) electrode through a corresponding first electrode from theplurality of first electrodes.
 5. The light emitting display panel ofclaim 4, wherein the 2-1^(th) electrode is connected to the 1-1^(th)electrode, and the 2-2^(th) electrode is connected to the 1-2^(th)electrode.
 6. The light emitting display panel of claim 5, wherein aside surface of the 2-1^(th) electrode is connected to a side surface ofthe 1-1^(th) electrode.
 7. The light emitting display panel of claim 1,wherein the plurality of first electrodes comprise: a connectionelectrode connected to the pixel driving circuit; and a plurality ofdivision electrodes spaced apart from one another.
 8. The light emittingdisplay panel of claim 7, wherein a width of the connection electrode isless than a width of each of the plurality of division electrodes, and alength of the connection electrode is longer than a length of each ofthe plurality of division electrodes.
 9. The light emitting displaypanel of claim 8, wherein at least two of the plurality of divisionelectrodes face the connection electrode in a lengthwise direction ofthe connection electrode.
 10. The light emitting display panel of claim1, wherein the planarization layer is a light blocking layer forperforming a function of blocking light emitted from the light emittinglayer.
 11. The light emitting display panel of claim 10, wherein theplanarization layer comprises a plurality of light blocking particles,each of the plurality of light blocking particles is a nano particle ora quantum dot including a metal material.
 12. The light emitting displaypanel of claim 1, further comprising a light blocking layer providedbetween the pixel driving circuit and the planarization layer.
 13. Thelight emitting display panel of claim 12, wherein the light blockinglayer is a silicon layer, a germanium layer, or a combination layerincluding a silicon layer and a germanium layer.
 14. The light emittingdisplay panel of claim 13, wherein the silicon layer is an amorphoussilicon layer, and the germanium layer is an amorphous germanium layer.15. The light emitting display panel of claim 11, wherein the pluralityof light blocking particles are provided in a whole display area of thesubstrate, or are provided in a region corresponding to the pixeldriving circuit of the display area.
 16. The light emitting displaypanel of claim 12, wherein the light blocking layer is provided in awhole display area of the substrate or is provided in a regioncorresponding to the pixel driving circuit of the display area.
 17. Thelight emitting display panel of claim 11, wherein the plurality of lightblocking particles are provided to cover all of the pixel drivingcircuit, or are provided to cover at least one of two or moretransistors included in the pixel driving circuit.
 18. The lightemitting display panel of claim 12, wherein the light blocking layercovers all of the pixel driving circuit, or covers at least one of twoor more transistors included in the pixel driving circuit.
 19. The lightemitting display panel of claim 11, wherein the pixel driving circuitcomprises: a driving transistor connected to the pixel drivingelectrode; a switching transistor connected to a gate electrode of thedriving transistor; and a sensing transistor connected between thedriving transistor and the pixel driving electrode, and wherein theplurality of light blocking particles are provided between the switchingtransistor and the pixel driving electrode and are provided between thesensing transistor and the pixel driving electrode.
 20. The lightemitting display panel of claim 12, wherein the pixel driving circuitcomprises: a driving transistor connected to the pixel drivingelectrode; a switching transistor connected to a gate electrode of thedriving transistor; and a sensing transistor connected between thedriving transistor and the pixel driving electrode, wherein the lightblocking layer is provided between the switching transistor and thepixel driving electrode and is provided between the sensing transistorand the pixel driving electrode.